CoRoT LRa02-E2-0121: Neptune-size planet candidate turns into a hierarchical triple system with a giant primary

L. Tal-Or; A. Santerne; T. Mazeh; F. Bouchy; C. Moutou; R. Alonso; D. Gandolfi; S. Aigrain; M. Auvergne; P. Barge; A. S. Bonomo; P. Bordé; H. Deeg; S. Ferraz-Mello; M. Deleuil; R. Dvorak; A. Erikson; M. Fridlund; M. Gillon; E. W. Guenther; T. Guillot; A. Hatzes; L. Jorda; H. Lammer; A. Léger; A. Llebaria; M. Ollivier; M. Pätzold; D. Queloz; H. Rauer; D. Rouan; Y. Tsodikovich; G. Wuchterl

doi:10.1051/0004-6361/201117374

CoRoT LRa02-E2-0121: Neptune-size planet candidate turns into a hierarchical triple system with a giant primary

L. Tal-Or, A. Santerne, T. Mazeh, F. Bouchy, C. Moutou, R. Alonso, D. Gandolfi, S. Aigrain, M. Auvergne, P. Barge, A. S. Bonomo, P. Bordé, H. Deeg, S. Ferraz-Mello, M. Deleuil, R. Dvorak, A. Erikson, M. Fridlund, M. Gillon, E. W. GuentherT. Guillot, A. Hatzes, L. Jorda, H. Lammer, A. Léger, A. Llebaria, M. Ollivier, M. Pätzold, D. Queloz, H. Rauer, D. Rouan, Y. Tsodikovich, G. Wuchterl

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5 Scopus citations

Abstract

This paper presents the case of CoRoT LRa02-E2-0121, which was initially classified as a Neptune-size transiting-planet candidate on a relatively wide orbit of 36.3 days. Follow-up observations were performed with UVES, Sandiford, SOPHIE, and HARPS. These observations revealed a faint companion in the spectra. To find the true nature of the system we derived the radial velocities of the faint companion using TODMOR-a two-dimensional correlation technique, applied to the SOPHIE spectra. Modeling the lightcurve with EBAS we discovered a secondary eclipse with a depth of∼0.07%, indicating a diluted eclipsing binary. Combined MCMC modeling of the lightcurve and the radial velocities suggested that CoRoT LRa02-E2-0121 is a hierarchical triple system with an evolved G-type primary and an A-type:F-type grazing eclipsing binary. Such triple systems are difficult to discover.

Original language	English
Article number	A67
Journal	Astronomy and Astrophysics
Volume	534
DOIs	https://doi.org/10.1051/0004-6361/201117374
State	Published - 11 Oct 2011
Externally published	Yes

Keywords

binaries
eclipsing
photometric
planetary systems
radial velocities
techniques

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1051/0004-6361/201117374

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Tal-Or, L., Santerne, A., Mazeh, T., Bouchy, F., Moutou, C., Alonso, R., Gandolfi, D., Aigrain, S., Auvergne, M., Barge, P., Bonomo, A. S., Bordé, P., Deeg, H., Ferraz-Mello, S., Deleuil, M., Dvorak, R., Erikson, A., Fridlund, M., Gillon, M., ... Wuchterl, G. (2011). CoRoT LRa02-E2-0121: Neptune-size planet candidate turns into a hierarchical triple system with a giant primary. Astronomy and Astrophysics, 534, Article A67. https://doi.org/10.1051/0004-6361/201117374

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title = "CoRoT LRa02-E2-0121: Neptune-size planet candidate turns into a hierarchical triple system with a giant primary",

abstract = "This paper presents the case of CoRoT LRa02-E2-0121, which was initially classified as a Neptune-size transiting-planet candidate on a relatively wide orbit of 36.3 days. Follow-up observations were performed with UVES, Sandiford, SOPHIE, and HARPS. These observations revealed a faint companion in the spectra. To find the true nature of the system we derived the radial velocities of the faint companion using TODMOR-a two-dimensional correlation technique, applied to the SOPHIE spectra. Modeling the lightcurve with EBAS we discovered a secondary eclipse with a depth of∼0.07%, indicating a diluted eclipsing binary. Combined MCMC modeling of the lightcurve and the radial velocities suggested that CoRoT LRa02-E2-0121 is a hierarchical triple system with an evolved G-type primary and an A-type:F-type grazing eclipsing binary. Such triple systems are difficult to discover.",

keywords = "binaries, eclipsing, photometric, planetary systems, radial velocities, techniques",

author = "L. Tal-Or and A. Santerne and T. Mazeh and F. Bouchy and C. Moutou and R. Alonso and D. Gandolfi and S. Aigrain and M. Auvergne and P. Barge and Bonomo, {A. S.} and P. Bord{\'e} and H. Deeg and S. Ferraz-Mello and M. Deleuil and R. Dvorak and A. Erikson and M. Fridlund and M. Gillon and Guenther, {E. W.} and T. Guillot and A. Hatzes and L. Jorda and H. Lammer and A. L{\'e}ger and A. Llebaria and M. Ollivier and M. P{\"a}tzold and D. Queloz and H. Rauer and D. Rouan and Y. Tsodikovich and G. Wuchterl",

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doi = "10.1051/0004-6361/201117374",

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Tal-Or, L, Santerne, A, Mazeh, T, Bouchy, F, Moutou, C, Alonso, R, Gandolfi, D, Aigrain, S, Auvergne, M, Barge, P, Bonomo, AS, Bordé, P, Deeg, H, Ferraz-Mello, S, Deleuil, M, Dvorak, R, Erikson, A, Fridlund, M, Gillon, M, Guenther, EW, Guillot, T, Hatzes, A, Jorda, L, Lammer, H, Léger, A, Llebaria, A, Ollivier, M, Pätzold, M, Queloz, D, Rauer, H, Rouan, D, Tsodikovich, Y & Wuchterl, G 2011, 'CoRoT LRa02-E2-0121: Neptune-size planet candidate turns into a hierarchical triple system with a giant primary', Astronomy and Astrophysics, vol. 534, A67. https://doi.org/10.1051/0004-6361/201117374

TY - JOUR

T1 - CoRoT LRa02-E2-0121

T2 - Neptune-size planet candidate turns into a hierarchical triple system with a giant primary

AU - Tal-Or, L.

AU - Santerne, A.

AU - Mazeh, T.

AU - Bouchy, F.

AU - Moutou, C.

AU - Alonso, R.

AU - Gandolfi, D.

AU - Aigrain, S.

AU - Auvergne, M.

AU - Barge, P.

AU - Bonomo, A. S.

AU - Bordé, P.

AU - Deeg, H.

AU - Ferraz-Mello, S.

AU - Deleuil, M.

AU - Dvorak, R.

AU - Erikson, A.

AU - Fridlund, M.

AU - Gillon, M.

AU - Guenther, E. W.

AU - Guillot, T.

AU - Hatzes, A.

AU - Jorda, L.

AU - Lammer, H.

AU - Léger, A.

AU - Llebaria, A.

AU - Ollivier, M.

AU - Pätzold, M.

AU - Queloz, D.

AU - Rauer, H.

AU - Rouan, D.

AU - Tsodikovich, Y.

AU - Wuchterl, G.

PY - 2011/10/11

Y1 - 2011/10/11

N2 - This paper presents the case of CoRoT LRa02-E2-0121, which was initially classified as a Neptune-size transiting-planet candidate on a relatively wide orbit of 36.3 days. Follow-up observations were performed with UVES, Sandiford, SOPHIE, and HARPS. These observations revealed a faint companion in the spectra. To find the true nature of the system we derived the radial velocities of the faint companion using TODMOR-a two-dimensional correlation technique, applied to the SOPHIE spectra. Modeling the lightcurve with EBAS we discovered a secondary eclipse with a depth of∼0.07%, indicating a diluted eclipsing binary. Combined MCMC modeling of the lightcurve and the radial velocities suggested that CoRoT LRa02-E2-0121 is a hierarchical triple system with an evolved G-type primary and an A-type:F-type grazing eclipsing binary. Such triple systems are difficult to discover.

AB - This paper presents the case of CoRoT LRa02-E2-0121, which was initially classified as a Neptune-size transiting-planet candidate on a relatively wide orbit of 36.3 days. Follow-up observations were performed with UVES, Sandiford, SOPHIE, and HARPS. These observations revealed a faint companion in the spectra. To find the true nature of the system we derived the radial velocities of the faint companion using TODMOR-a two-dimensional correlation technique, applied to the SOPHIE spectra. Modeling the lightcurve with EBAS we discovered a secondary eclipse with a depth of∼0.07%, indicating a diluted eclipsing binary. Combined MCMC modeling of the lightcurve and the radial velocities suggested that CoRoT LRa02-E2-0121 is a hierarchical triple system with an evolved G-type primary and an A-type:F-type grazing eclipsing binary. Such triple systems are difficult to discover.

KW - binaries

KW - eclipsing

KW - photometric

KW - planetary systems

KW - radial velocities

KW - techniques

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U2 - 10.1051/0004-6361/201117374

DO - 10.1051/0004-6361/201117374

M3 - Article

AN - SCOPUS:80053526196

SN - 0004-6361

VL - 534

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - A67

ER -

CoRoT LRa02-E2-0121: Neptune-size planet candidate turns into a hierarchical triple system with a giant primary

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